uint8 UNDEFINED             = 0
uint8 FAR_IRRELEVANT_SIGN   = 1
uint8 IN_HOSTLANE_SIGN      = 2
uint8 NOT_IN_HOSTLANE       = 3
uint8 HIGHWAY_EXIT_SIGN     = 4
uint8 SIGN_ON_TURN          = 5
uint8 TSR_RAMP_RELEVANT     = 6

uint8 relevancy